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/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "str.h"
#include "array.h"
#include "smtp-syntax.h"
#include "smtp-server-private.h"
/* EHLO, HELO commands */
static void
cmd_helo_completed(struct smtp_server_cmd_ctx *cmd,
struct smtp_server_cmd_helo *data)
{
struct smtp_server_connection *conn = cmd->conn;
struct smtp_server_command *command = cmd->cmd;
i_assert(smtp_server_command_is_replied(command));
if (!smtp_server_command_replied_success(command)) {
/* Failure */
return;
}
if (conn->pending_helo == &data->helo)
conn->pending_helo = NULL;
/* Success */
smtp_server_connection_reset_state(conn);
i_free(conn->helo_domain);
conn->helo_domain = i_strdup(data->helo.domain);
conn->helo.domain = conn->helo_domain;
conn->helo.domain_valid = data->helo.domain_valid;
conn->helo.old_smtp = data->helo.old_smtp;
}
static void
cmd_helo_next(struct smtp_server_cmd_ctx *cmd,
struct smtp_server_cmd_helo *data)
{
struct smtp_server_connection *conn = cmd->conn;
if (null_strcmp(conn->helo.domain, data->helo.domain) != 0 ||
conn->helo.old_smtp != data->helo.old_smtp)
data->changed = TRUE; /* Definitive assessment */
}
static void
smtp_server_cmd_helo_run(struct smtp_server_cmd_ctx *cmd, const char *params,
bool old_smtp)
{
struct smtp_server_connection *conn = cmd->conn;
const struct smtp_server_callbacks *callbacks = conn->callbacks;
struct smtp_server_cmd_helo *helo_data;
struct smtp_server_command *command = cmd->cmd;
bool first = (conn->pending_helo == NULL && conn->helo.domain == NULL);
const char *domain = NULL;
int ret;
/* Parse domain argument */
if (*params == '\0') {
smtp_server_reply(cmd, 501, "", "Missing hostname");
return;
}
ret = smtp_helo_domain_parse(params, !old_smtp, &domain);
smtp_server_command_pipeline_block(cmd);
if (conn->state.state == SMTP_SERVER_STATE_GREETING) {
smtp_server_connection_set_state(conn, SMTP_SERVER_STATE_HELO,
NULL);
}
helo_data = p_new(cmd->pool, struct smtp_server_cmd_helo, 1);
helo_data->helo.domain = p_strdup(cmd->pool, domain);
helo_data->helo.domain_valid = ( ret >= 0 );
helo_data->helo.old_smtp = old_smtp;
helo_data->first = first;
command->data = helo_data;
if (null_strcmp(conn->helo.domain, domain) != 0 ||
conn->helo.old_smtp != old_smtp)
helo_data->changed = TRUE; /* Preliminary assessment */
if (conn->pending_helo == NULL)
conn->pending_helo = &helo_data->helo;
smtp_server_command_add_hook(
command, SMTP_SERVER_COMMAND_HOOK_NEXT,
cmd_helo_next, helo_data);
smtp_server_command_add_hook(
command, SMTP_SERVER_COMMAND_HOOK_COMPLETED,
cmd_helo_completed, helo_data);
smtp_server_command_ref(command);
if (callbacks != NULL && callbacks->conn_cmd_helo != NULL) {
/* Specific implementation of EHLO command */
ret = callbacks->conn_cmd_helo(conn->context, cmd, helo_data);
if (ret <= 0) {
i_assert(ret == 0 ||
smtp_server_command_is_replied(command));
/* Command is waiting for external event or it failed */
smtp_server_command_unref(&command);
return;
}
}
if (!smtp_server_command_is_replied(command)) {
/* Submit default EHLO reply if none is provided */
smtp_server_cmd_ehlo_reply_default(cmd);
}
smtp_server_command_unref(&command);
}
void smtp_server_cmd_ehlo(struct smtp_server_cmd_ctx *cmd, const char *params)
{
/* ehlo = "EHLO" SP ( Domain / address-literal ) CRLF */
smtp_server_cmd_helo_run(cmd, params, FALSE);
}
void smtp_server_cmd_helo(struct smtp_server_cmd_ctx *cmd, const char *params)
{
/* helo = "HELO" SP Domain CRLF */
smtp_server_cmd_helo_run(cmd, params, TRUE);
}
struct smtp_server_reply *
smtp_server_cmd_ehlo_reply_create(struct smtp_server_cmd_ctx *cmd)
{
static struct {
const char *name;
void (*add)(struct smtp_server_reply *reply);
} standard_caps[] = {
/* Sorted alphabetically */
{ "8BITMIME", smtp_server_reply_ehlo_add_8bitmime },
{ "BINARYMIME", smtp_server_reply_ehlo_add_binarymime },
{ "CHUNKING", smtp_server_reply_ehlo_add_chunking },
{ "DSN", smtp_server_reply_ehlo_add_dsn },
{ "ENHANCEDSTATUSCODES",
smtp_server_reply_ehlo_add_enhancedstatuscodes },
{ "PIPELINING", smtp_server_reply_ehlo_add_pipelining },
{ "SIZE", smtp_server_reply_ehlo_add_size },
{ "STARTTLS", smtp_server_reply_ehlo_add_starttls },
{ "VRFY", smtp_server_reply_ehlo_add_vrfy },
{ "XCLIENT", smtp_server_reply_ehlo_add_xclient }
};
const unsigned int standard_caps_count = N_ELEMENTS(standard_caps);
struct smtp_server_connection *conn = cmd->conn;
struct smtp_server_command *command = cmd->cmd;
struct smtp_server_cmd_helo *helo_data = command->data;
const struct smtp_capability_extra *extra_caps = NULL;
unsigned int extra_caps_count, i, j;
struct smtp_server_reply *reply;
reply = smtp_server_reply_create_ehlo(cmd->cmd);
if (helo_data->helo.old_smtp) {
i_assert(cmd->cmd->reg->func == smtp_server_cmd_helo);
return reply;
}
i_assert(cmd->cmd->reg->func == smtp_server_cmd_ehlo);
extra_caps_count = 0;
if (array_is_created(&conn->extra_capabilities)) {
extra_caps = array_get(&conn->extra_capabilities,
&extra_caps_count);
}
i = j = 0;
while (i < standard_caps_count || j < extra_caps_count) {
if (i < standard_caps_count &&
(j >= extra_caps_count ||
strcasecmp(standard_caps[i].name,
extra_caps[j].name) < 0)) {
standard_caps[i].add(reply);
i++;
} else {
smtp_server_reply_ehlo_add_params(
reply, extra_caps[j].name,
extra_caps[j].params);
j++;
}
}
return reply;
}
void smtp_server_cmd_ehlo_reply_default(struct smtp_server_cmd_ctx *cmd)
{
struct smtp_server_reply *reply;
reply = smtp_server_cmd_ehlo_reply_create(cmd);
smtp_server_reply_submit(reply);
}
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